Home
Class 7
CHEMISTRY
Which is true about the process Aeration...

Which is true about the process Aeration ?(i) It is used for removal of bacteria in water.(ii) Chlorine is sent into the water for eradication of bacteria (iii) In this method water is pumped into the air(iv)Bacteria in this water get killed as a result of exposure of sun rays

A

i, iii and iv only

B

i, ii and iii only

C

iii and iv only

D

All of these

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • SYNTHETIC FIBRES AND PLASTICS

    NCERT TELUGU|Exercise EXERCISE|16 Videos

  • WEATHER AND CLIMATE

    NCERT TELUGU|Exercise Improving your learning|18 Videos

Similar Questions

Explore conceptually related problems

A gas which kills the bacteria present in drinking water is:

Which of the following is not true about sewage(i) Sewage is more in rural areas(ii) Sewage water is useful for crop plants (iii) Nitrates are one of the impurities of sewage(iv) Draining out sewage water is good method for cleaning the area

Only the surface atoms in an adsorbent, play an active role in adsorption. These atoms posses some residual forces like vander Waal's forces and chemical forces. In the process of adsorption, weak adsorbate is substituted by strong adsorbate. Activated charcoal used in gas mask is already exposed to the atmospheric air, so the gases and water vapours in air are adsorbed on its surface. When the mask is exposed to chlorine atmosphere, the gases are displaced by chlorine. Porous and finely powdered solids, e.g., charcoal and Fuller's earth adsorb more as compared to the hard non-porous material. It is due to this property that the powdered characoal is used in gas masks. In general, easily liquefiable gases like CO_2, NH_3, Cl_2 , and SO_2 etc., are adsorbed to a greater extent than the elemental gases, eg., H_2, N_2, O_2, He , etc. Which of the following gases will be most easily adsorbed by the charcoal in the gas mask

Only the surface atoms in an adsorbent, play an active role in adsorption. These atoms posses some residual forces like vander Waal's forces and chemical forces. In the process of adsorption, weak adsorbate is substituted by strong adsorbate. Activated charcoal used in gas mask is already exposed to the atmospheric air, so the gases and water vapours in air are adsorbed on its surface. When the mask is exposed to chlorine atmosphere, the gases are displaced by chlorine. Porous and finely powdered solids, e.g., charcoal and Fuller's earth adsorb more as compared to the hard non-porous material. It is due to this property that the powdered characoal is used in gas masks. In general, easily liquefiable gases like CO_2, NH_3, Cl_2 , and SO_2 etc., are adsorbed to a greater extent than the elemental gases, eg., H_2, N_2, O_2, He , etc. Which of the following gases will substitute O_2 from adsorbed charcoal

Some statements about heavy water are given below. (i) Heavy water is used as a moderator in nuclear reactors (ii) Heavy water is more associated than ordinary water. (iii) Heavy water is more effective solvent than ordinary water Which of the above statements are correct ?

What is the name given to certain material which can be break down into smaller fragments in the presence of water, sun light and oxygen and by bacteria?

Rearrange the following sentences in a correct order(i) A skimmer removes the floatable solids like oil and grease(ii) Solid like faeces settle at the bottom and are removed with a scraper.This is the sludge(iii) The water is allowed to settle in a large tank which is sloped towards the middle.(iv)Water so cleared is called clarified water

Which of the following sinks in water? i) Stone ii)Paper iii)Tomato iv)Egg

NCERT TELUGU-WATER-EXERCISE
  1. Statement A: Chlorine kills harmful disease causing organisms present ...

    Text Solution

    |

  2. Statement A: Nitrates, phosphates, metals etc. are examples for organi...

    Text Solution

    |

  3. Which is true about the process Aeration ?(i) It is used for removal o...

    Text Solution

    |

  4. Which of the following is not true about sewage(i) Sewage is more in r...

    Text Solution

    |

  5. Purifying water by spraying it into sunlight to kill bacteria is calle...

    Text Solution

    |

  6. A simple techinique that breaks down waste material and helps in the g...

    Text Solution

    |

  7. The disease causing germs in waste water can be killed by using the ga...

    Text Solution

    |

  8. International decade for action on Water for life' is

    Text Solution

    |

  9. Available fresh water on land is of the total water

    Text Solution

    |

  10. Oldest VanaSamrakshana Samithi in A.P. is

    Text Solution

    |

  11. When do we celebrate World Water Day?

    Text Solution

    |

  12. The waste water from the bathroom can be led intoto grow vegetables:

    Text Solution

    |

  13. Biogas is produced by

    Text Solution

    |

  14. Solids like faeces which settle at the bottom of a large tank during t...

    Text Solution

    |

  15. This allows growth of microbes that breakdown wastes

    Text Solution

    |

  16. Rearrange the following sentences in a correct order(i) A skimmer remo...

    Text Solution

    |

  17. Fill in the Blanks and give reasons:Cleaning of water is a process of ...

    Text Solution

    |

  18. Fill in the Blanks and give reasons:Waste water released by houses is ...

    Text Solution

    |

  19. Fill in the Blanks and give reasons:Dried isused as a manure.

    Text Solution

    |

  20. Fill in the Blanks and give reasons:Drains get blocked byand

    Text Solution

    |